Discuss the three important features when it comes to selecting cases and controls, and identify a situation when one of these might be violated. Discuss the limitations of using questionnaires for determining exposure status and provide examples of alternative strategies for collecting this information in a case-control study.
3 Features:
In situation when one of these is violated we need to check the behaviour of estimate under these conditions.
Limitations of using questionnaires for determining exposure status.-
Examples of alternative strategies:
A retrospective study. Eg A control group of people who do not have the bone fracture or the one whi has not experienced it is used for comparison.
Discuss the three important features when it comes to selecting cases and controls, and identify a...
In a case-control study, selection bias can occur when ndividuals in the eligible population have the same probability of being included in the study. Controls are selected from the population which gave rise to the cases. Sampling fractions of cases differs from that of controls, but is independent of exposure status Sampling fractions among cases or controls differ according to exposure status. In a case-control study, selection bias can occur when ndividuals in the eligible population have the same probability...
Part 3:1dentify the following features with appropriate study design: ...Case-control study 1 b. Cohort study Categorize subjects on the basis of exposure and then follow up to see if they develop the health condition we are studying. 1. Generally used to explore rare diseases. Useful for exploring several risk factors for a given outcome. After some time compare the disease rate for the exposed with that of the unexposed. Generally used when the exposure is rare. 1 Useful when there...
In an epidemiologic study, 147 incident bladder cancer cases were compared to 179 controls selected from the population that gave rise to the cases with respect to smoking history. The data were as follows: Exposure status Disease Status Case Control Total Smoker 90 82 172 Nonsmoker 57 97 154 Total 147 179 326 Perform the appropriate statistical test of the relationship between bladder cancer and smoking history using the attached SAS file. Assume α = 0.05 (two-tailed) and 80%...
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